<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>bind</title>
</head>

<body>
   <script type="text/javascript">
        function demo(){
            console.log(this)
        }
        demo()
        const x=demo.bind({a:'新的this'})
        x()
    </script>
</body>

</html>